Through-running suction and pressure piston pump



J. KRAUS `lune 21, 1966 THROUGH-RUNNING SUCTION AND PRESSURE PISTON PUMP Filed Jan. 20, 1964 United States Patent O 4 claims. (cl 10s-166.5)

There is known a through-running suction and pressure pump in which on each side of the extension of the piston tube there is provided a displaceable valve in the suction nozzle and in the pressure nozzle respectively, whereby when the piston is displaced, one of the two valves is opened with a positive action and the other valve is closed (Austrian Patent No. 203,371). This pump makes possible the pumping and the independent running-through of iiuid. It has not been possible however, to control the through-flow promptly and with assurance. Furthermore it has not been possible to interrupt the flow to the vessels to be filled as desired, so that a pump which was once actuated could not be employed to fill several ves-sels. In addition, a return lioW of the liuid from the filled pump into the filling vessel was not possible.

In a suction and pressure through-running piston pump in which on both sides in the extension of the piston cylinder, in each direction of the piston displacement, there is provided a displaceable valve and wherein an axially displaceable inlet valve is designed in the handle as a drop Valve while the outlet 'Valve is car-ried along by a trailing part, it is proposed, according to the invention, that the piston tube should be provided with a pair of recesses into which extend carries at the trailing part while the piston tube is provided at it-s inner end with a stop slideable on the trailing part, said stop bearing on the t-railing part stop thereby pressing the outlet valve into a blocking position, the trailing part being provided with a stop abutting against the closing part, which securely maintains the outlet valve .in its open position 3,256,835 Patented June 21, 1966 U FIG. 3 is a view similar to FIG. 1, showing the pump 1n its initial non-operating position and FIG. 4 illustrates a modied constructional detail, partly in section, of the means for securing the piston tube to the piston.

Referring now to the drawing in detail, the outlet of the suction and the through-How pressure piston pump is indicated by the letter A. The pump comprises a cylinder 1 with a seal or terminal portion 2 and a circular cover 3, provided with a pair of air outlets 3a, screwed into the cylinder. The sealing cover provided with a cone is mounted on the cylinder.

An outlet part 4 is screwed on the terminal portion 2 and the-re is further provided a threaded cap 5 for securing the outlet tube 6.

In the interior of the cylinder there is displaceably mounted a tubular piston 7 which is guided by the cover 3. Piston 7 is provided with a piston 8 having pressure and suction lips 8, 8b and a sealing cone 8c. The outer end of the tubular piston 7 terminates in a piston handle 7a. A threaded cap 9 is mounted on the end of the A handle 7a. The threaded cap 9 secures an inlet tube 11 while the guide part of the inlet valve is provided with a circular recess in which the gripping parts of the trailing part extend and securely. hold the inlet valve in an open outflow position.

In a further embodiment of the invention the end of the trailing part which is disposed opposite the blocking According t-o a further inventive concept, the blocking V parts of the Valve are designed as pointed cones, so that a complete whirl-free passage of the fluid is assured. Finally it is proposed, according to the invention, to screw into an inner thread of the piston tube a clamping stop for securing the piston and to provide both parts of the piston with respective sealing cones.

These and other important objects of the invention will become apparent from the following description and the accompanying drawing illustrating a preferred embodiment of the invention.

It should be understood, however, that these are given by way of illustration and not of limitation, and that various changes in the details, form and arrangement of the parts may be made Without departing from the scope of the invention.

In the drawing:

FIG. 1 is a view in elevation and partly in cross-section of the pump with the pump handle in fully extracted position,-

FIG. 2 is a View similar tol that of FIG. 1 showing the pump in an intermediate operating position,

with an inlet nipple 10 in a conical seat in the handle 7a. The interior of the handle 7a is provided with an inlet valve 12 having a seat 12a, th-ree passage openings 12b and a cone 12e which cooperates with the inlet nipple 10. The inlet valve 12 extends with its rearward portion into a guide 12d which is provided with a circular recess 12C. A hollow trailing part 13, for an outiiow valve 14, is mounted in the tubular piston 7, interiorly of the cylinder 1. The trailing part 13 with its three carriers 13b serves as a stop part for the inlet valve 12.

The trailing part 13 is provided with three longitudinal recesses 13a resulting in a -spring action. In addition, the trailing part 13 s provided with carriers 13b, extending the height of the recesses 13a. The carriers 13b can protrude interchangeably into the recesses 7b or 7c of the cylinder tube. The trailing part is further provided with a limiting stop 13C for the inner piston tube end 7d, slideable on said trail-ing part. The hollow trailing part 13 contains three longitudinal recesses 13d, adjacent to the outlet valve, which also continue to the conically-shaped part 13C, and a stop 13g, which bears upon thecylinder part 2 and secures the outlet valve 14 in its open position (FIGS. l and 3). This part is provided with a threaded end and with yet another sealing cone and carries the sealing valve 14, which with its coneshaped part 14a cooperates with the cone 2a of the cylin` der closing part 2.

It should be noted that a damage-proof guidance of the piston and particularly of the piston lips is made possible by means io-f cone-shaped cover 3.

As shown in FG. 4, the securing of the piston 8 on the piston tube 7 may Ibe effected by screwing a clamp` support 15 on its inner thread, whereby both parts of piston 8 are provided with corresponding sealing cones. A convenient exchangeability of the pistons is assured thereby. In addition, the manu-facture of pistons is more economical, particularly because expensive materials must be employed for certain purposes.

It is recommended that all parts be made of synthetic material, e.g. material known as Hart-PVC, when using lye solutions, acids, alcohol, benzine, oil and the like.

The operation of the device is as follows:

When filling ffro-m higher disposed into lower disposed vessels, the outlet tube 6 is introduced into the vessel t-o be filled, while the piston pump is in the initial position shown in FIG. 3. In this position no vacuum flow can as yet take place from the filling vessel. When the handle 7a is pulled `out orf the pump, the Valve 14 is closed at the iirst stop as shown in FIG. 2. During the further pulling out of the piston handle to the end position shown in FIG. 3 a vacuum is produced. In the complete pumping cycle the piston tubes stop bears on the trailing parts stop 13g, thereby pressing the outlet valve into a blocking position, the limiting stop 13C abutting against said stop 13g, which securely maintains the outlet valve in its open position, while the gripping portions 13b securely hold the inlet valve inan open outflow position. The direction of fluid llow during a complete pumping cycle is shown by arrows in FIGS. 1 and 2. With a multiple repetition of the pump cycle the filler 2 as well as the pump are slowly filled and an outflow of the lluid :takes place into the vessel to be lled. A-s soon as the latter is lled, the outflow may be interrupted by pushing back the piston handle as shown in FIG. 2 and the next container may be lilled after the piston handle is pressed in. The -fluid may be emptied until a complete emptying of the lillin'g vessel is effected.

The pumping cycle is as -followsz The pumip is held at chest height, with the discharge tube directed upwards. The inlet valve 12l functions automatically in cooperation with the discharge valve 14. As

. the piston handle is moved inwards, the outlet valv-e 14 is opened, while the air in the cylinder is pressed outwards. The inlet valve 12 is closed partly by its own weight and partly by the slight pressure of air i.e. air overpressure.

When the piston handle is pulled, the outlet valve 14 closes, so that air can no longer reach the cylinder. A vacuum is lformed in the cylinder when the piston is pulled back. Due -to this vacuum the inlet valve 12 is lifted, so that the fluid may enter the vacuum space in the cylinder.

As the pump handle is moved inwards, the fluid in the cylinder is pressed outwards and flows through the outlet valve 14, while the outlet side is held downward in the container to be filled.

When the container is filled, the outlet end is closed by pulling back the piston handle to `one of the closed positions. This operation is repeated until the required containers are filled. In this case the container from which the liquid is drawn off is lower than that to be illed.

Should the container, from which liquid is to be drawn off, be at a higher level than .that to be filled, it is only necessary to actuate the pump until the fluid is discharged rirom the outlet. When the container is filled, the piston is pulled back and the outlet valve is thereby closed. Now the outlet tube can be introduced into the next container to be filled. Should the lluid in the tube and in the pump ilow back into :the container from which fluid is drawn off, it is only necessary to insert the outlet tube in this container -and to move the piston to the stop, whereby the through-110W opening is freed.

After a-completed filling cycle, the bottom outlet is closed by pulling out the piston handle to the first stop as shown in FIG. 2. Thereupon the pump -is lifted up, so that the outlow tube is pointed upwardly and the 4 fluid ows back into the filling vessel. By pressing the piston handle again, the pump as well as the tube are emptied and can now be laid aside in a rest position until the next use.

In pumping from vessels into higher position vessels where therefore there is no head or fall, the handle of the piston tube 7a must be Iactuated along the entire stroke length for a while until the vessel is filled as desired.

What I claim is:

1. A through-running suction and pressure pump comprising a cylindrical housing having upper and lower end portions, a piston tube displaceable axially of said housing and having its upper portion formed as a handle, an inlet valve displaceable in said handle and serving as a drop valve, a hol-low trailing part .displaceable axially in said piston and provided with a conical abutment, an outlet valve carried by said trailing part, said piston tube having a pair of recesses, said trailing part being provided with a pair of carriers extendable into said recesses, said piston tube having an end portion slideable on said trailing part and bearing on said conical abutment, thereby pressing the outlet valve into open position, said trailing part being further provided with a stop element abutting against said housings lower portion, whereby the outlet valve is held in its open position, said'outlet valve having a guide portion provided with a circular recess, said carriers extending into said recesses While the pump is in lstarting linitial position to maintain the inlet valve in open position.

2. The pump according to claim 1, wherein the end portion of the trailing part disposed opposite the outlet valve is provided with longitudinal slots.

3. The pump according to claim 1, wherein 4the outlet valves are constructed as conical valves, whereby a ifull whirl-free fluid passage is assured.

4. The pump according to claim 1, wherein the piston tube is provided with an outer thread, an intermediate piston member disposed between said piston tube and said cylinder, said intermediate piston member having an inner thread in engagement with said outer thread, said intermediate pist-on having sealing cones.

References Cited by the Examiner UNITED STATES PATENTS 1,374,980 4/ 1921 Bossert 103-227 1,479,978 l/1924 Bobrick et al 10S-227 1,884,750 10/ 1932 Koppelman et al 103-227 FOREIGN PATENTS 203,371 10/ 1958 Austria. 577,325 9/ 1924 France.

SAMUEL LEVINE, Primary Examiner.

DONLEY J. STOCKING, Examiner.

W. L. FREEH, Assistant Examiner. 

1. A THROUGH-RUNNING SUCTION AND PRESSURE PUMP COMPRISING A CYLINDRICAL HOUSING HAVING UPPER AND LOWER END PORTIONS, A PISTON TUBE DISPLACEABLE AXIALLY OF SAID HOUSING AND HAVING ITS UPPER PORTION FORMED AS A HANDLE, AN INLET VALVE DISPLACEABLE IN SAID HANDLE AND SERVING AS A DROP VALVE, A HOLLOW TRAILING PART DISPLACEABLE AXIALLY IN SAID PISTON AND PROVIDED WITH A CONICAL ABUTMENT, AN OUTLET VALVE CARRIED BY SAID TRAILING PART, SAID PISTON TUBE HAVING A PAIR OF RECESSES, SAID TRAILING PART BEING PROVIDED WITH A PAIR OF CARRIES EXTENDABLE INTO SAID RECESSES, SAID PISTON TUBE HAVING AN END PORTION SLIDEABLE ON SAID TRAILING PART AND BEARING ON SAID CONICAL ABUTMENT, THEREBY PRESSING THE OUTLET VALVE INTO OPEN POSITION, SAID TRAILING PART BEING FURTHER PROVIDED WITH A STOP ELEMENT ABUTTING AGAINST SAID HOUSING''S LOWER PORTION, WHEREBY THE OUTLET VALVE IS HELD IN ITS OPEN POSITION, SAID OUTLET VALVE HAVING A GUIDE PORTION PROVIDED WITH A CIRCULAR RECESS, SAID CARRIES EXTENDING INTO SAID RECESSES WHILE THE PUMP IS IN STARTING INITIAL POSITION TO MAINTAIN THE INLET VALVE IN OPEN POSITION. 